OWA accessing problems to ExchangeServer

I downloaded Exchange2007 sp1 v'rtual machine from microsoft's site.But when i used owa to access exchangeserver..i got some problems firstly accessing over another client open up the port that exchange uses...
and any other one

Request
Url: https://WWW.MyDomain.com:443/owa/default.aspx
User host address: X.X.X.X

Exception
Exception type:
Microsoft.Exchange.Data.Storage.ConnectionFailedTransientException
Exception message: Cannot open mailbox /o=TheCompany/ou=Exchange
Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=ahmad.

Call stack

Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String
serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid,
Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag,
CultureInfo cultureInfo, String clientInfoString, Boolean secondTry)
Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String
serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid,
Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag,
CultureInfo cultureInfo, String clientInfoString, Boolean secondTry)
Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String
serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid,
Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag,
CultureInfo cultureInfo, String clientInfoString)
Microsoft.Exchange.Data.Storage.MailboxSession.Initialize(LogonType
logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object
identity, OpenMailboxSessionFlags flags)
Microsoft.Exchange.Data.Storage.MailboxSession.CreateMailboxSession(LogonType
logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object
identity, OpenMailboxSessionFlags flags, CultureInfo cultureInfo, String
clientInfoString)
Microsoft.Exchange.Data.Storage.MailboxSession.Open(ExchangePrincipal
mailboxOwner, WindowsPrincipal authenticatedUser, CultureInfo cultureInfo,
String clientInfoString)
Microsoft.Exchange.Clients.Owa.Core.OwaWindowsIdentity.CreateMailboxSession(ExchangePrincipal
exchangePrincipal, CultureInfo cultureInfo)
Microsoft.Exchange.Clients.Owa.Core.UserContext.Load(OwaContext owaContext)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.CreateUserContext(OwaContext
owaContext, UserContextKey userContextKey, UserContext& userContext)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.PrepareRequestWithoutSession
......
so what_ i googled and found solution as starting some exchange services...
the list

1. Microsoft Exchange Information Store
2.Microsoft Exchange POP3
3.Microsoft Exchange Mail Submission
4. Microsoft Exchange Unified Messaging
5.Microsoft Exchange System Attendant
6. Microsoft Exchange Transport.

the link